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valuables    音标拼音: [v'æljəbəlz] [v'æljubəlz]
n. 贵重物品

贵重物品


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  • Helium - Wikipedia
    Helium (from Greek: ἥλιος, romanized: helios, lit 'sun') is a chemical element; it has symbol He and atomic number 2 It is a colorless, odorless, non-toxic, inert, monatomic gas and the first in the noble gas group in the periodic table
  • Helium (He) - Periodic Table
    Helium (He) Helium is the 2nd element in the periodic table and has a symbol of He and atomic number of 2 It has an atomic weight of 4 00260 and a mass number of 4 Helium has two protons and two neutrons in its nucleus, and two electrons in one shell It is located in group eighteen, period one and block s of the periodic table
  • Helium - Element information, properties and uses | Periodic Table
    Element Helium (He), Group 18, Atomic Number 2, s-block, Mass 4 003 Sources, facts, uses, scarcity (SRI), podcasts, alchemical symbols, videos and images
  • Helium | Definition, Properties, Uses, Facts | Britannica
    Ordinary air contains about 5 parts per million of helium, and Earth’s crust is only about 8 parts per billion The nucleus of every helium atom contains two protons, but, as is the case with all elements, isotopes of helium exist The known isotopes of helium contain from one to six neutrons, so their mass numbers range from three to eight
  • Atomic Number of Helium He
    Atomic Number of Helium is 2 Chemical symbol for Helium is He Number of protons in Helium is 2 Atomic weight of Helium is 4 002602 u or g mol Melting point of Helium is -272,2 °C and its the boiling point is -268,9 °C
  • Helium Facts - Atomic Number 2 or He - Science Notes and Projects
    Helium is a chemical element with the symbol He and atomic number 2 It is a colorless, odorless, tasteless, non-toxic, inert, monatomic gas that heads the noble gas group in the periodic table
  • Periodic Table of Elements: Los Alamos National Laboratory
    Seven isotopes of helium are known: Liquid helium (He-4) exists in two forms: He-4I and He-4II, with a sharp transition point at 2 174K He-4I (above this temperature) is a normal liquid, but He-4II (below it) is unlike any other known substance
  • Chemical Symbol for Helium - He - Periodic Table of Elements
    Helium is a chemical element with atomic number 2 which means there are 2 protons and 2 electrons in the atomic structure The chemical symbol for Helium is He
  • Helium | He (Element) - PubChem
    Periodic Table element Summary Helium Helium is a chemical element with symbol He and atomic number 2 Classified as a noble gas, Helium is a gas at 25°C (room temperature)
  • Helium (He) - Periodic Table
    Helium (He) Helium is a chemical element of the periodic table with chemical symbol He and atomic number 2 with an atomic weight of 4 0026 u and is classed as noble gas and is part of group 18 (noble gases)





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